A building's shell is the interface with the outside world and offers protection while simultaneously representing its owners or occupants. This books explores the exterior termination of a building, the wall, the facade, which can be made of various materials, surfaces, and achieves different design effects. It shows the conditions under which certain constructions can be employed and why; what criteria such as construction costs, issues of sustainability, of energy efficiency, of assembly or of insulation or protection against moisture can also influence the choice of a system.